ITER Nb3Sn strand quality verification tests require large quantities of precise measurements. Therefore regular cross-checking between testing laboratories is critically important. In this paper, we present results from a cross-checking test of 140 samples between the National High Magnetic Field Laboratory, USA and the University of Twente, the Netherlands. The tests comprise measurements at 4.2 K on critical current, RRR and hysteresis loss, while at room temperature the chromium layer thickness, Cu/nonCu ratio, filament twist pitch, and diameter were determined. Our results show very good agreement between the two labs. The reasons for small random discrepancies are discussed.
@article{arxiv.1701.00446,
title = {Comparative measurements of ITER Nb3Sn strands between two laboratories},
author = {J. Lu and S. Hill and D. McGuire and K. Dellinger and A. Nijhuis and W. A. J. Wessel and H. J. G. Krooshoop and K. Chan and N. N. Martovestky},
journal= {arXiv preprint arXiv:1701.00446},
year = {2018}
}